DESCRIPTION
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This module adds a 'diff' tab for sufficiently permissioned users. The tab shows all revisions similar standard Drupal
but it also provides pretty viewing of all added/changed/deleted words between revisions.

INSTALL
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Install as usual for Drupal modules

TECHNICAL
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- we are comparing the whole node body after it passes through the output filters. This is the analogous the chunk
of HTML which gets indexed by search.module.
- The PEAR Diff library comes with this module, and powers the comparing of revisions.

TODO
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consider using in core.